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Aug 28, 2016 | 06:10 PM

#11

cvaria

Seasoned HDF Member

Joined: Sep 2012

Posts: 12,367

Likes: 2,215

From: Tallahassee, Florida

Quote:

Originally Posted by dotcom2000

I guess I didn't word my question right. I've been riding sportsters for a while now. I upgraded to a '06 1200 L a few years ago and I'll admit the rubber mounting is a big improvement. I won't go newer than an '06 'cause I can do my own work on a carbed bike. But I've had more than a couple people ask my why I don't go bigger for the smoother ride. I've been riding for over 50 years and too old and set in my ways to want to change now, I'm a sporty fan and will remain so. But if the ultras and soft tails etc. have the same 45 degree engine why are they so much smoother? Just curious thats all.

bigger pistons moving slower(lower rpm)... boom.... boom.... vs boom boom boom... less violent feel. my dyna vibes just like my sporty, just slower and less violent. the BT thump is great.. but, BTs still vibrate. the softails and touring bikes have more dampening. the M8 is way smoother... my mind was blown by how smooth the new 107 is.

Last edited by cvaria; Aug 28, 2016 at 06:13 PM.

Aug 28, 2016 | 07:16 PM

#12

Imold

Seasoned HDF Member

Joined: Jul 2011

Posts: 27,096

Likes: 4,673

From: Frozelandia, Minnysota

Quote:

Originally Posted by sawka

How were people guessing at this? Really the only motors that dont vibrate are boxer engines because they cancel out (by design). Even that 4 banger in your focus vibrates. Cars just have hella good dampers. Same concept as the rubber mount design (which is in new sporsters).

Edit: I guess theoretically the 8 piston design of airplanes where they are all opposing each other would also cancel out as jaytee stated. I just have no real working knowledge of airplane motors.

Radials vibrate a lot, but that big prop in front dampens a lot of it - flywheel effect, and more mass to absorb the vibration. A Sportster engine doesn't have a lot of rotating weight; it'll rev up fast, but really transmit the vibration to anything it's attached to, and the rubber mounts only absorb some of it. Japanese motors are smooth because many of them have counterbalancers - that really takes out the vibration when done right. It probably wouldn't be hard for Harley to make a real smooth counterbalanced motor for the sportster. Since they've made them a lot quieter when obviously the majority of owners want more noise, it might not be a stretch to think they'll smooth it out someday.

Aug 28, 2016 | 07:59 PM

#13

Derf_

Tourer

Joined: Feb 2016

Posts: 456

Likes: 76

From: Montreal

http://www.cycleworld.com/2016/02/01...sound-insights

Aug 29, 2016 | 10:34 AM

#14

multihdrdr

Club Member

Joined: Oct 2011

Posts: 11,175

Likes: 2,483

From: Nor Cal

Quote:

Originally Posted by dotcom2000

...I've been riding sportsters for a while now. I upgraded to a '06 1200 L a few years ago and I'll admit the rubber mounting is a big improvement...

So what's your preference on the vibration difference between the 03-Earlier SOLID "EVO" vs. 04-later Rubber "EVO"?

Does... "I'll admit the rubber mounting is a big improvement..." mean 04-later Rubber "EVO"?

I posted a POLL here:
POLL: ____ Vibration Preference? ____ 03-Earlier SOLID "EVO" vs. 04-later Rubber "EVO"

Aug 29, 2016 | 12:35 PM

#15

John Harper

HDF Community Team

Joined: Dec 2011

Posts: 8,550

Likes: 3,976

From: San Diego, CA

Quote:

Originally Posted by cvaria

here's a quick question, why do tires roll?

Energy applied through torque, friction of rubber to ground, ground pushing back against the torque force. Newton's Third Law of motion.

http://www.school-for-champions.com/...m#.V8RxYygrLIU

John

Aug 29, 2016 | 12:45 PM

#16

MikeLaPlaya

Tourer

Joined: Dec 2013

Posts: 380

Likes: 21

From: Colombia

velocity

Aug 29, 2016 | 02:48 PM

#17

Bluesrider.df

Grand HDF Member

Joined: Jul 2015

Posts: 4,354

Likes: 1,967

From: PA

One thing I've noticed as I've tried a few different sets of slip-ons on my '07 is that the bike was a heck of a lot smoother with stock pipes and even Screamin' Eagle 80db pipes. With the Cycle Shack 105db pipes I have, it vibrates a lot, hand-tingling and all.

Aug 29, 2016 | 03:50 PM

#18

Dan89FLSTC

Seasoned HDF Member

Joined: May 2008

Posts: 21,135

Likes: 12,696

From: South Carolina

Quote:

Originally Posted by sawka

Edit: I guess theoretically the 8 piston design of airplanes where they are all opposing each other would also cancel out as jaytee stated. I just have no real working knowledge of airplane motors.

Radial engines all have odd numbers of cylinders in each bank....

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Aug 29, 2016 | 04:49 PM

#19

cvaria

Seasoned HDF Member

Joined: Sep 2012

Posts: 12,367

Likes: 2,215

From: Tallahassee, Florida

Quote:

Originally Posted by John Harper

Energy applied through torque, friction of rubber to ground, ground pushing back against the torque force. Newton's Third Law of motion.

http://www.school-for-champions.com/...m#.V8RxYygrLIU

John

you are so fired.